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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.util;
import android.text.TextUtils;
/**
* Parses a list of key=value pairs, separated by some delimiter, and puts the results in
* an internal Map. Values can be then queried by key, or if not found, a default value
* can be used.
* @hide
*/
public class KeyValueListParser {
private final ArrayMap<String, String> mValues = new ArrayMap<>();
private final TextUtils.StringSplitter mSplitter;
/**
* Constructs a new KeyValueListParser. This can be reused for different strings
* by calling {@link #setString(String)}.
* @param delim The delimiter that separates key=value pairs.
*/
public KeyValueListParser(char delim) {
mSplitter = new TextUtils.SimpleStringSplitter(delim);
}
/**
* Resets the parser with a new string to parse. The string is expected to be in the following
* format:
* <pre>key1=value,key2=value,key3=value</pre>
*
* where the delimiter is a comma.
*
* @param str the string to parse.
* @throws IllegalArgumentException if the string is malformed.
*/
public void setString(String str) throws IllegalArgumentException {
mValues.clear();
if (str != null) {
mSplitter.setString(str);
for (String pair : mSplitter) {
int sep = pair.indexOf('=');
if (sep < 0) {
mValues.clear();
throw new IllegalArgumentException(
"'" + pair + "' in '" + str + "' is not a valid key-value pair");
}
mValues.put(pair.substring(0, sep).trim(), pair.substring(sep + 1).trim());
}
}
}
/**
* Get the value for key as a long.
* @param key The key to lookup.
* @param def The value to return if the key was not found, or the value was not a long.
* @return the long value associated with the key.
*/
public long getLong(String key, long def) {
String value = mValues.get(key);
if (value != null) {
try {
return Long.parseLong(value);
} catch (NumberFormatException e) {
// fallthrough
}
}
return def;
}
/**
* Get the value for key as a float.
* @param key The key to lookup.
* @param def The value to return if the key was not found, or the value was not a float.
* @return the float value associated with the key.
*/
public float getFloat(String key, float def) {
String value = mValues.get(key);
if (value != null) {
try {
return Float.parseFloat(value);
} catch (NumberFormatException e) {
// fallthrough
}
}
return def;
}
/**
* Get the value for key as a string.
* @param key The key to lookup.
* @param def The value to return if the key was not found.
* @return the string value associated with the key.
*/
public String getString(String key, String def) {
String value = mValues.get(key);
if (value != null) {
return value;
}
return def;
}
}
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